The SMS API trusted by 3,000+ Indian businesses

Send your first OTP in 3 lines. REST API, webhooks, automatic retries, sub-3-second delivery. Built for developers.

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DLT compliant <3s delivery 99.9% uptime
Trusted by 3,000+ businesses across India
Wipro Lotus Hospital Sona College Brahma Kumaris Kopuram Chits Profes
What we do

SMS Services built for modern businesses

From OTPs to mass campaigns, one platform for every SMS need.

Promotional SMS

Reach prospects and customers with offers, announcements and campaigns. Send to individuals, groups or upload an Excel sheet.

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Transactional SMS

Send OTPs, alerts and notifications 24×7 with priority routes. DLT-compliant delivery to all networks.

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SMS API

Integrate SMS into your app with REST and HTTP APIs. Sample code in PHP, Python, Node and more.

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Why SmsHorizon

India's fast, reliable and affordable SMS service provider

We power messaging for start-ups, educational institutions and blue-chip enterprises across India. With direct telco connectivity, transparent pricing and responsive support, we make business messaging effortless.

Superfast Airtel, Jio, Vi 5 lakh SMS in one hit Real-time delivery reports 30-min human support Web & excel upload High Performance APIs
DELIVERED < 3s
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Your OTP is 481923. Valid for 5 minutes. Do not share with anyone.
now · via SmsHorizon
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Order #A-2891 confirmed. Shipping today, expected delivery by Friday.
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bulk SMS api service provider in india
All-in-one platform

SMS, RCS and Virtual Numbers in one platform

Run every messaging channel from a single panel and a single set of APIs. Send bulk and transactional SMS, launch rich RCS campaigns, and receive inbound messages on a virtual number, all integrated under one login with one support team behind it.

Promotional, transactional & OTP SMS RCS Business Messaging Inbound virtual numbers REST & HTTP APIs
By the numbers

A billion messages delivered, and counting

Since 2011
1B+
SMS delivered to Indian mobile numbers
3,000+
Active customers
99.9%
Uptime SLA
< 3s
Avg delivery time
30 min
Avg support reply
Reviews

Real customers, real reviews

“

Signed up, sent my first message, got it delivered in seconds, all within a minute. Their API was up and running on my PHP app instantly. Support is impressive too, most emails answered in minutes.

N
Nikhil RajeevBangalore, Karnataka
“

I've tried more than 5 SMS providers and SmsHorizon is the best in every aspect. Got 3× more calls than with other providers. Transparent and genuine service. Hats off!

S
SaurabMumbai, Maharashtra
“

We send transactional alerts to thousands of students every day. Delivery is consistently fast and the DLT compliance handling saved us weeks of paperwork.

P
Priya MenonChennai, Tamilnadu
4.4 50+ verified reviews
FAQs

Frequently asked questions

What is Bulk SMS Service?
Bulk SMS allows a large number of messages to be delivered through mobile networks. It is primarily used by businesses to communicate with existing or prospective customers.
What is the difference between Promotional and Transactional SMS?
Promotional SMS is for marketing campaigns, offers and announcements, sent to opt-in audiences between 9 AM and 9 PM. Transactional SMS is for time-sensitive customer-initiated messages like OTPs, alerts and order updates, delivered 24×7 to all networks including DND-registered numbers.
Can I send Promotional SMS at night?
No. TRAI regulations restrict promotional SMS to a 9 AM to 9 PM window. Transactional SMS (OTPs, alerts) is unrestricted and delivers 24×7.
Is Transactional SMS delivered 24×7?
Yes. Transactional SMS delivers around the clock on priority routes, including to DND-registered numbers, with OTPs typically landing in under 3 seconds.
How many SMS can I send at once?
You can send up to 2 lakh SMS in a single click. For higher volumes, our support team can assist.
How long will my SMS take to deliver?
A single SMS typically delivers in about 3 seconds. A 10,000-message campaign usually completes in under 5 minutes.
Can I choose my Sender ID?
Yes. You can register a 6-character sender ID that reflects your brand name.
Do you offer an SMS API?
Yes. Our REST API lets you send OTPs, alerts and bulk campaigns through a single endpoint. It supports JSON responses, bearer-token authentication, and webhook callbacks for real-time delivery reports.
Which programming languages does your SMS API support?
The API is HTTP-based, so it works with any language. Customers integrate with PHP, Node.js, Python, Java, .NET, Ruby, curl, Postman, WordPress, WooCommerce, Shopify and Zapier.
Is DLT registration mandatory?
Yes. TRAI regulations require entity, header and template registration on the DLT portal for all commercial SMS to Indian numbers. We assist with the entire registration process free of charge.
Do you support Unicode and regional languages?
Yes. Send messages in Hindi, Tamil, Telugu, Bengali, Marathi and 15+ other Indian languages. Set the API type to uni or pick Unicode in the web panel.
500 free SMS credits · No card required

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